We investigate the influence of cosmological constant Λ on gravitational lensing. By the method of an elliptic integral, we give out the solution to the null geodesic equation in the Reissner–Nordstrom–de Sitter spacetime. The deflection angle of light is obtained by studying the intrinsic geometry of the spatial equatorial plane in the Reissner–Nordstrom–de Sitter spacetime. By applying the expansion of elliptic integrals, we find the deflection angle in the weak field limit and in the strong field limit, respectively. We find the angular...
